There are lines at superchargers? Never seen one. But I live in NY and have barely left the state in the last year. NJ, CT, RI & MA are as far as I ever get these days.
With Tidal coming in a wifi only mode, this will be very handy. If I ever do that cross country trip I'll download a new bunch at each charge session.
And yes, I've heard out west it can be pretty bad sometimes.